General minor code clean up and typo fixes

bukkit/src/main/java/com/github/games647/fastlogin/bukkit/FastLoginBukkit.java

@@ -124,7 +124,7 @@ public class FastLoginBukkit extends JavaPlugin implements PlatformPlugin<Comman
                         logger.info("Floodgate prefix injection workaround has been enabled.");
                         logger.info("If you have problems joining the server, try disabling it in the configuration.");
                     } else {
-                        logger.warn("We have detected that you are runnging FastLogin alongside Floodgate and ProtocolLib.");
+                        logger.warn("We have detected that you are running FastLogin alongside Floodgate and ProtocolLib.");
                         logger.warn("Currently there is an issue with FastLogin that prevents Floodgate name prefixes from showing up "
                                 + "when it is together used with ProtocolLib.");
                         logger.warn("If you would like to use Floodgate name prefixes, you can enable an experimental workaround by changing "

bukkit/src/main/java/com/github/games647/fastlogin/bukkit/command/ToggleCommand.java

@@ -81,7 +81,7 @@ public abstract class ToggleCommand implements CommandExecutor {
             plugin.getBungeeManager().sendPluginMessage((PluginMessageRecipient) invoker, message);
         } else {
             Optional<? extends Player> optPlayer = Bukkit.getServer().getOnlinePlayers().stream().findFirst();
-            if (!optPlayer.isPresent()) {
+            if (optPlayer.isEmpty()) {
                 plugin.getLog().info("No player online to send a plugin message to the proxy");
                 return;
             }